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ymchwilio

to investigate

"ymchwilio" means "to investigate" in Welsh. Full conjugation table with present, imperfect, preterite, future, conditional, and imperative tenses.

Present

Presennol

PersonForm
I (fi)ymchwiliaf
You sg. (ti)ymchwili
He/She (fe/hi)ymchwilio
We (ni)ymchwiliwn
You pl. (chi)ymchwiliwch
They (nhw)ymchwiliant
Impersonalymchwilir

Imperfect

Amherffaith

PersonForm
I (fi)ymchwiliwn
You sg. (ti)ymchwilit
He/She (fe/hi)ymchwiliai
We (ni)ymchwiliem
You pl. (chi)ymchwiliech
They (nhw)ymchwilient
Impersonalymchwilid

Preterite

Gorffennol

PersonForm
I (fi)ymchwiliais
You sg. (ti)ymchwiliaist
He/She (fe/hi)ymchwiliodd
We (ni)ymchwiliasom
You pl. (chi)ymchwiliasoch
They (nhw)ymchwiliasant
Impersonalymchwiliwyd

Pluperfect

Gorberffaith

PersonForm
I (fi)ymchwiliaswn
You sg. (ti)ymchwiliasit
He/She (fe/hi)ymchwiliasai
We (ni)ymchwiliasem
You pl. (chi)ymchwiliasech
They (nhw)ymchwiliasent
Impersonalymchwiliasid

Future

Dyfodol

PersonForm
I (fi)ymchwiliaf i
You sg. (ti)ymchwili di
He/She (fe/hi)hi o
We (ni)ymchwiliwn ni
You pl. (chi)ymchwiliwch chi
They (nhw)ymchwilian nhw

Conditional

Amodol

PersonForm
I (fi)ymchwiliwn
You sg. (ti)ymchwilit
He/She (fe/hi)hi
We (ni)ymchwiliem
You pl. (chi)ymchwiliech
They (nhw)ymchwilient
Impersonalymchwilid

Imperative

Gorchmynnol

PersonForm
I (fi)-
You sg. (ti)ymchwilia
He/She (fe/hi)ymchwilied
We (ni)ymchwiliwn
You pl. (chi)ymchwiliwch
They (nhw)ymchwilient
Impersonalymchwilier

Example sentences

Ac wedyn rhywbeth arall, wrth gwrs, o ran atebolrwydd yw'r gallu i ymchwilio i gwynion.

And then something else, of course, in terms of accountability is the ability to investigate complaints.

B1

Fe wnaeth eich cynigion cychwynnol chi awgrymu y byddai'r comisiynydd yna yn medru sefydlu rhyw fath o weithdrefn ar gyfer ymchwilio i gwynion.

Your initial proposal suggested that the commissioner would be able to establish a procedure for the investigation of complaints.

B2

Felly, mae swyddogion safonau masnach yn defnyddio'r pwerau hynny i ymchwilio i'r rhai sy'n achosi colledion ariannol a gofid, ac i gymryd camau yn eu herbyn.

So, trading officers are using those powers to investigate and take action against those who cause financial loss and distress.

C1

Further reading

Welsh Verb Conjugation — All Tenses, Full Tables, Clear Patterns →The Welsh Verb Bod (To Be) — Every Form, Every Tense →Welsh Pronunciation — It's Actually Easier Than English →Best Apps to Learn Welsh (2026) →Browse all Welsh verb conjugations →

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